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// Makros for simplified single pin io access.
#define PORT_(port) PORT ## port
#define DDR_(port) DDR ## port
#define PIN_(port) PIN ## port
#define PORT(port) PORT_(port)
#define DDRR(port) DDR_(port)
#define PINN(port) PIN_(port)
#define SET_DDR(p) DDRR(p##_PORT) |= (1<<p##_BIT)
#define CLEAR_DDR(p) DDRR(p##_PORT) &= ~(1<<p##_BIT)
#define OUTPUT_ON(p) PORT(p##_PORT) |= (1<<p##_BIT)
#define OUTPUT_OFF(p) PORT(p##_PORT) &= ~(1<<p##_BIT)
#define INPUT(p) ((PINN(p##_PORT) & (1<<p##_BIT)) != 0)
/*
Use Like this:
#define LED_PORT C
#define LED_BIT 7
#define SWITCH_PORT B
#define SWITCH_BIT 0
int main(){
SET_DDR(LED); //set to output
OUTPUT_ON(SWITCH); //turn on pullup
if(INPUT(SWITCH)){
OUTPUT_ON(LED);
}else{
OUTPUT_OFF(LED);
}
}
*/